rs63751650

chr2-47429940-A-Cchr2-47429940-A-Gchr2-47429940-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_000251.3(MSH2):c.1275A>C(p.Glu425Asp) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 2/2 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E425K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MSH2 NM_000251.3 missense, splice_region
• Scores: Splicing: ADA: 0.4774
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.59

Genes affected

MSH2 (HGNC:7325): (mutS homolog 2) This locus is frequently mutated in hereditary nonpolyposis colon cancer (HNPCC). When cloned, it was discovered to be a human homolog of the E. coli mismatch repair gene mutS, consistent with the characteristic alterations in microsatellite sequences (RER+ phenotype) found in HNPCC. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 10 benign, 13 uncertain in NM_000251.3
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.108299136).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3	c.1275A>C	p.Glu425Asp	missense_variant, splice_region_variant	7/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7	c.1275A>C	p.Glu425Asp	missense_variant, splice_region_variant	7/16	1	NM_000251.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 15, 2021

The p.E425D variant (also known as c.1275A>C), located in coding exon 7 of the MSH2 gene, results from an A to C substitution at nucleotide position 1275. The glutamic acid at codon 425 is replaced by aspartic acid, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
Cadd	Uncertain	25
Dann	Benign	0.85
DEOGEN2	Benign	0.34	T;.;.;.
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.14
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.86	D;D;D;D
M_CAP	Benign	0.053	D
MetaRNN	Benign	0.11	T;T;T;T
MetaSVM	Benign	-0.40	T
MutationAssessor	Benign	1.0	L;.;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.29	N;N;.;N
REVEL	Uncertain	0.47
Sift	Benign	1.0	T;T;.;T
Sift4G	Benign	0.93	T;T;.;T
Polyphen		0.0	B;.;.;B
Vest4		0.50
MutPred		0.37		Loss of methylation at K427 (P = 0.0746);.;Loss of methylation at K427 (P = 0.0746);Loss of methylation at K427 (P = 0.0746);
MVP		0.94
MPC		0.0067
ClinPred		0.18	T
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.8
Varity_R		0.15
gMVP		0.20

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.48
dbscSNV1_RF	Benign	0.48
SpliceAI score (max)		0.48		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.48		Position offset: -47

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs63751650; hg19: chr2-47657079;